Relief-valve for locomotives.



J. MGCLUSKEY.

RELIEF VALVE FOR LOCUMOTIVES.

MPLIGATION FILED YER. 23, 1912.

Patented NQV. 26, 1912.

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W7 MK JAMES MCCLUSKEY, QF NORTH BAY, lil

RELEF-VALVE LC'LMTNTES.

l reliet valves for locomotives and the object of the invention is to devise a simple and cheap torni et valve ot' this class which will be absolutely steam tight and which will have no parts liable to breakage or to other l wise get out of order and also a valve which will be noiseless in its operation.

Figure l, is a` general perspective view of my relief valve. Fig. 2, is a sectional view tl'nfough the valve showing the piston valve in the normal position. Fig. 3, is a similar view to Fig. 2, showing the piston valve in the raised or closed position. Fig. 4, is a perspective view et a detail of the piston valve. Fig. 5, is a perspective view ot a detail of the lower member of the piston valve. Fig'. 6, is a similarview of the upper member of the piston f lve. Fig." 7, is a perspective view of a 'detail of one ot' the intermediately split rings.

ln the drawings like letters of reference indicate eorreslfionding` parts in each figure. A is the valve casing having a series of orifices A extending through the wall there- F of and in proximity to the top of the casing. D B is the steam inlet pipe provided with a flaring internal portion B. The pipe B is threaded into the lower end oit' the casing A and the internal diameter at the end oit the pipe is slightly smaller' than the internal diameter ot' the easing A thereby forming an annular shoulder B2 in proximity to the lower end et the easing A.

C is a cap which is threaded into the4 upper end of the casing and is provided with a tapered seat C extending,r into the .top of the easing` as indicated in Figs. 2

and 3.

D is my piston valve comprising the lower member D annular in form and provided D4 is the upper member of the valve pis- 5 vton which is also annular in forinvand is of auch diameter as to t at its lower end with Specification of Letters Patent.

Application led'February 23, 1912. Serial -o. @dL/1&3?.

in the lower member ll. `The upper; end et the member D* is provided with an enlargement D gnovided with a bevel portion D extending between the enlargement and the loweiI poi ion et the. member.

DT and D3 are split rin provided with inclined internal walls D@ and D10 fitting against the inclined portions lli and D oi.z the upper and lower members D and D* respectively. and so that tl tlat faces ot' th rings abut cach other as indicated. The member Di is also provided with an' internal tapered seat D designed to tit the 'seat l j when the piston valve aised to its upper position indicated in Fig. 3. It 'will also be seen on referring to Fig. oriiiees A closed by the piston valve when in its raised position.

lt will be understood that when the engine is what termed drifting" or running without steam air is drawn through the orifices A and through the vcenter et the valve into the cylinder. ln'u'nfi-zdiately however, the engine is put under steam the 'steam enters the valve casing` through the pipe B expand ingoutwardly in the flaring portion B ot the pipe and striking against. the portion ot th valve i'iiston D2 overhanging the shoulder lig so as to raise the piston valve and brine,- the seat D thereof against the seat C thereby eloeinp; the valvef is soon as the portion D" is seated on the portion C the steam pressure serves to torce the lower member ot the piston valve upwardly over the redured or ins-iin portion et the members ll thereby carrying; 'the beveled portions D3 and DG toward ear-h other against the inclined 'faces ot the spring .rings D7 and DE and torcing them to expand outwardly against the internal face ot the wall ot the valve c vli nder casing. lt will also be under- .stood that when steam is turned on to the engine a certain amount will pass through the valve into the upper portion ot the easing before it Closes and will form a cushion preventing any noien caused by the valve striking its seat when closing. The same effect occurs when steam is turned oil and a certain amount et steam remains beneath the valve piston thereby cushioning it. as it. drops onto the shoulder B2.

To prevent the splits in the split rings coming into alineinent and thereby allowing the steam to leali through the splits into the upper part et the valve easing l provide that the I lo upon l"ending Jfrom eccli oiz' the 'sten valve into corren 4fied in the split rings. .event the split rings turning m in definite position prevenu bereut comino' into alinement. Eri;` ion it will be seen that very simple 'formof relief ve for locomotives which will be noiseless ion, absolutely su in tight, havliable to break or otherwise get and which will ce cheap to in as mv invention is. A i valve 'for locomotives compris- 'ffdrical casing having a closed 'ug orilioes located in the wall groxil'nity to the upper end eid on o, steam inlet pipe leed- .owerend of the casing, .i valve d tbe upper end ofA the casc having an orifice excenter thereof and detsel'f at its upper end on the the casing when forced upi' ssure, and expansible in ie wall of the valve ned to expand oiltwardly mtciior well of the valve cylinas lie valve piston is seated afspurpose speoied. c valve tor locomotives comprisv nflriccl casing having a closed no 7ii g o. valve seat formed on thc :noe thereof and: having oriiices in b closed upper end of the cassip ipe extending into the lower ,Y so a to form an interior i a oivided valve piston supported upon tbc shoulder and l orifice extending thereveive seat at its upper end t upon tlie seat ol the steam pressure is exerted ',nserted in the wall of lon a d expanded by forcing b 'rs of the valve together, i purpose specified. v i l ie valve for locomotive engines a cylindrical casing' having a closed upper d hav a valve seat on its interior face T li-aiding orifices extending through the well c pensi lni'a el fece or the valve and exof split rings inserted between the aforeim seid opposing beeveled faces and having corresponding beveled faces whereby the split rings are expanded outwardly as the upper and lower members of the valve are forced together by steam pressure exerted avainst the lower end of the valve as the valve is seated on the scant or' tile vulve ons ing, as and forthe iurpose specied.

4. ln a device o 'the class described, the combination with the valve casing having e valve seat at its upper end, of a divided valve piston, split spring rings inserted within the wall of the piston and designed to be foroedupwardly against the wall of the casing Iby pressure upon the lowerend oi the valve, as and 'for the purpose specied.

5. In a device of the class described, a divided piston valve comprising the lower'. cup-shaped portion having an outwardly beveled upper edge, un upper portion iitting at its lower end within the lower portion and. terminating in an 'outwardly beveledface leading into an enlargement, and a pair of abutting split rings having correspond-v ingly beveled faces and fitting between the opposingl beveled faces of the piston valve members, as and for the purpose specified.

6. ln a device of the class idescribed, a piston valve comprising a lower cup-shaped l member having a central orifice and a beveled upper edge, an upper member :fitting within the cup-shaped member and having anv outwardly beveled lince extending into an enlargement and a central orifice registering with the orifice oi the lower member, and abutting split rings having faces beveled correspondingly to the beveled faces oi. the valve members and zitting therebetween 'as and for the purpose specilied f 7. in a device of the class described, a 11o Adivided piston valve comprising tlielower vcup-slraped portion having an outwardly beveled upper edge, an upper portion fitting at its lower endwithin the lower portion and terminating in an outwardly beveled 11.'I face leading into an enlargement, and a pail' of abutting split rings having correspondingly beveled faces and fitting between the opposing beveled faces of the piston valve members, and dowel pins extending from the valve members into orifices in the split rings, es und for the purpose specified. 4

8. In a relief valve for locomotives, the combination with tbe valve casing having a closed upper end having a valve seat on its interior face, and having orifices extending through the walls of the valve casing in mouth and forming an annular shoulder around the interior of the valve, a, Valve piston normally resting upon the shoulder and expansblomeans inserted `Within the wall of the Valve piston anddesigned to be forced outwardly by pressure against the Wall of the casing below the aforesaid orices as the valve lis seated by pressure against the seat of the lcasing as and for the purpose specied.; v Y

JAMES MCCLUSKEY. Witnesses:

GLADYS BURN, HULDA KEATS. 

